Metal deforming – By use of closed-die and coacting work-forcer – Forcing work into or within closed die; e.g. – forging
Patent
1997-11-25
1999-07-13
Larson, Lowell A.
Metal deforming
By use of closed-die and coacting work-forcer
Forcing work into or within closed die; e.g., forging
72335, B21D 5304
Patent
active
059211300
ABSTRACT:
An object of the present invention is to provide a very thin heat exchanging fin, having collars with tough flanges that are not deformed when the heat exchanging tubes are integrated therewith. The heat exchanging fin includes: a plate section having a plurality of through-holes through which a heat exchanging tube will be pierced; and a plurality of collars having a prescribed height, each of the collars extending from an edge of each of the through-holes and having a flange at a front end, characterized in: that an inner face of each collar is formed perpendicular to the plate section; and that thickness of a base end part of each of the collars, which is connected to the plate section, is thicker than that of a middle part thereof. With this structure, the strength of the base end part of the collars can be greater even if the collars are made higher and thinner. The deformation of the collars can be prevented when the heat exchanging tubes are pierced and integrated with the collars.
REFERENCES:
patent: 4213323 (1980-07-01), De Deugd
patent: 5159826 (1992-11-01), Miyazawa et al.
Hidaka Seiki Kabushiki Kaisha
Larson Lowell A.
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